Workaround for the WaitHandle.WaitAll 64 handle limit?

Question

My application spawns loads of different small worker threads via ThreadPool.QueueUserWorkItem which I keep track of via multiple ManualResetEvent

Answer 1

protected void WaitAllExt(WaitHandle[] waitHandles)
{
    //workaround for limitation of WaitHandle.WaitAll by <=64 wait handles
    const int waitAllArrayLimit = 64;
    var prevEndInd = -1;
    while (prevEndInd < waitHandles.Length - 1)
    {
        var stInd = prevEndInd + 1;
        var eInd = stInd + waitAllArrayLimit - 1;
        if (eInd > waitHandles.Length - 1)
        {
            eInd = waitHandles.Length - 1;
        }
        prevEndInd = eInd;

        //do wait
        var whSubarray = waitHandles.Skip(stInd).Take(eInd - stInd + 1).ToArray();
        WaitHandle.WaitAll(whSubarray);
    }

}